Film-piercing spark unit



7 2 c. F. JENKINS FILM PIERCING SPARK UNIT Filed Jan. 2, 1925 3L PMPatented Aug. 23, 1927.

PATENT OFFICE.

CHARLES FRANCIS JENKINS, OF WASHINGTON, DISTRICT OF COLUMBIA.

FILM-PIERCING SPARK UNIT.

Application filed January 2, 1925. Serial No. 221.

This invention relates to apparatus for receiving radio photographicmessages, and has for its principal object a simple and effective meansfor making the record.

\Vith this and other objects in View the invention consists of the novelcombination of elements herein disclosed and particularly pointed out inthe claim.

In the drawings Figure 1 is an elevation,

and Figure 2 a top view with adiagram of the wiring to the radioreceivingset.

In the drawings A is a threaded shaft upon which is a wide faced gear Bengaged by a worm C on the motor shaft. Dis a metal cylinder also on theshaft A, carrying thereon a sheet of paper D'.. E is a spark point, oneterminal of a suitable transformer F, the other: terminal ofwhich isattached to the shaft support G. The pri- 9 mary of the transformer isattached to a radio receiving set H.

When radio signals are received there is a spark discharge between thepoint E and the metal cylinder D, which spark passing through the paperwould perforate it, making a matrix from which prints could be made. Ifthe order of the radio signals representedthe letters of a message thenthe sparks would perforate a matrix Which would print a copy of theoriginal letter. Or if the paper was also light sensitive, a photorecord would appear. If the sensitive surface were on metalized paperthe photo record only would remain, no perforating resulting.

' What I claim, is

The combination of a rotating cylinder, a threaded shaft to rotate andto advance said cylinder, a wide-faced gear for rotating said shaft,said gear having a face equalto the longitudinal movement of said shaft.

CHARLES FRANCIS JENKINS.

